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While an echo type per se would fit into the type chart, why leak it now? 3 days before the conference and not when... well... when all the other leaks started. Leaking one type but completely ignoring the other while knowing how two new types would totally destroy the balance of the world?
Atleast with Sylveon there is a basis for assuming the fairy type, but the is no basis whatsoever with the echo type (although I like it)